JP3186294B2 - Light-emitting display unit - Google Patents

Abstract

PURPOSE:To obtain excellent front surface taking-out efficiency by removing metallic foil having a stabilization treated surface facing the front side of a substrate over the entire surface and reflecting the infiltrating light past the removed part to the metallic surface of the metallic foil existing on the rear side of the substrate. CONSTITUTION:The light infiltrating part x of the four-layered substrate A has a structure in which there is no copper foil of the second layer and the light infiltrating part x is covered by the copper foil 22b of the third layer. The stabilization treated layer 23a formed by a black treatment, etc., on the front surface of the copper foil 22a of the second layer faces the front side of the four-layered substrate A but the stabilization treated layer 23a does not exist in the light infiltrating part x and, therefore, the light infiltrating the light infiltrating part x infiltrates a resin plate 21 of the second sheet and passes this plate. Further, this light shines on the rear surface of the copper foil 22b of the third layer covering the light infiltrating part x. The stabilization treated layer 23a of the dark color formed on the front surface of the copper foil 22b faces the rear side of the four-layered substrate A and the metallic surface is exposed on the rear surface of the copper foil 22b on which the light shines without the presence of the stabilization treated layer 23a of the dark color thereon and, therefore, the light past the resin plate 21 is reflected to the metallic surface of the copper foil 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display unit for displaying a character or the like in a dot pattern by selectively lighting a plurality of light emitting elements regularly mounted and arranged on a substrate.

[0002]

2. Description of the Related Art In an LED display unit used for displaying dot patterns of characters and the like, a multilayer substrate capable of increasing the density of wiring and the like has begun to be used as the substrate. FIG. 1 shows a structural example of a conventional LED display unit using a typical four-layer substrate as a multilayer substrate.

The LED display unit comprises a four-layer board A,
The housing B includes a housing B stacked on the surface of the four-layer board A, and an LED element C mounted on the four-layer board A in each opening b of the housing B. Here, the four-layer substrate A includes three unit substrates 10, 20, and 30.

A unit substrate 10 on the front side is made of a copper foil 1 on a front surface of a resin plate 11 made of a translucent resin such as a polyimide resin.
2 are joined, and the surface thereof is plated with gold 13. The purpose of the gold plating 13 is to improve the corrosion resistance, the bonding property of the LED element C, and the reflectivity.
In order to pass a current through the LED element C, the area around the LED element C is removed by etching together with the copper foil 12.

[0005] A unit board 30 on the back side is formed of a copper foil 32 on a back side surface of a resin plate 31 made of a translucent resin such as a polyimide resin.
Are joined.

The intermediate unit substrate 20 has a structure in which copper foils 22a and 22b are joined to a front surface and a back surface of a resin plate 21 made of a translucent resin such as a polyimide resin. Each surface of the copper foils 22a and 22b is
Stabilization layers 23a and 23b are formed in order to increase the adhesiveness of the 30 to the resin plates 11 and 31. As the stabilization treatment, a black treatment that forms a black compound more stable than sulfide is usually used.

[0007] As described above, the four-layer board A has four layers of copper foil 12, which are laminated via three resin plates 11, 21, 31.
22a, 22b, and 32. Therefore, it is called a four-layer substrate. Each of the copper foils 12, 22a, 22b, 32 has a predetermined pattern shape.

[0008]

In such an LED display unit, the light emitted from the LED element C on the four-layer substrate A is emitted not only directly to the front side but also in various directions. . The light is reflected by the inner surface of the opening b of the housing B and the four-layer substrate A and emitted to the front side. Therefore, the portion located in the opening b of the four-layer substrate A is the reflection portion X
Becomes

In a portion of the reflecting portion X of the four-layer substrate A where the gold plating 13 exists, the light emitted from the LED element C is reflected by the gold plating 13 on the surface of the four-layer substrate A. It does not enter the inside of the layer substrate A (). However, the gold plating 13 and copper foil 1
In the portion where 2 is removed, the light emitted from the LED element C enters the inside of the four-layer substrate A.

In the light penetration portion x, the copper foils 22a, 22b and 32 of the second to fourth layers have an unrelated pattern shape. The surface of the second-layer copper foil 22a faces the front side, and the surfaces of the third-layer and fourth-layer copper foils 22b and 32 face the rear side. Therefore, the stabilization processing layer 23a faces the front side, and the stabilization processing layer 23b faces the back side.

Here, as shown in FIG. 2, the copper surface has a high reflectance for red light having a long wavelength. for that reason,
In the light penetration part x, the copper foil 22a does not exist and the copper foil 22b
In the portion where there is, the intruding light is efficiently reflected on the back surface (metal surface) of the copper foil 22b (). Also, in a portion where the copper foil 32 is present without the copper foil 22a and the copper foil 22b, the intruding light is reflected on the metal back surface of the copper foil 32 ().

However, in the portion where the copper foil 22a is present, the light that has entered the inside of the four-layer substrate A is absorbed by the stabilizing layer 23b on the surface of the copper foil 22a and is not reflected to the front side (). Therefore, the efficiency of extracting light from the front decreases. Even in a portion where none of the copper foils 22a, 22b and the copper foil 32 is present, the light that has entered the inside of the four-layer substrate A escapes to the back side of the four-layer substrate A, so that the efficiency of extracting light from the front decreases. ).

Recently, the area occupied by the copper foil is large in order to enhance the heat radiation of the substrate, and in an LED display unit using the four-layer substrate A, the light penetration portion x in the reflection part X of the four-layer substrate A is The reduction in the front surface take-out efficiency due to the presence of the black stabilization layer 23a has begun to become a major problem.

The present invention has been made in view of such circumstances, and despite the use of a multi-layer substrate having a dark stabilization layer formed on the surface of a metal foil, the front surface extraction efficiency of the stabilization layer can be reduced. It is an object of the present invention to provide a light emitting display unit that does not deteriorate.

[0015]

According to the present invention, there is provided a light emitting display unit in which a metal foil having a predetermined pattern is laminated in four or more layers through a translucent resin plate, and a metal foil is physically formed on the surface of the metal foil of the intermediate layer. A plurality of light emitting devices are regularly mounted and arranged on a multi-layer substrate subjected to a stabilization process for forming a stable dark compound, and characters and the like are displayed in a dot pattern by selectively lighting the light emitting devices. Light emitting display unit,
In the light-entering portion where the metal foil on the substrate surface has been removed in the reflective portion near the light emitting element mounting position of the multilayer substrate, the stabilization processing surface is on the front side of the substrate so that the penetrating light is not absorbed by the dark stabilization processing layer. The metal foil facing toward the substrate is completely removed, and the light-entering portion is so set that the intruding light passing through the removed portion is reflected by the metal foil located on the back side of the substrate from the removed metal foil.
Of any metal foil located below the removed part
It is covered.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows one embodiment of the present invention. The symbols in the figure are
This corresponds to the reference numeral given to the conventional example in FIG.

The present light emitting display unit is different from the conventional light emitting display unit shown in FIG. 1 in the structure of the light penetration part x in the reflection part X of the four-layer substrate A. The light penetration portion x of the four-layer substrate A in the present light emitting display unit does not have the second layer copper foil 22a, and the light penetration portion x is formed by the third layer copper foil 22b.
It is structured to cover.

A dark stabilizing layer 23a is formed on the surface of the second layer of copper foil 22a by blackening or the like. The stabilizing layer 23a faces the front side of the four-layer substrate A, but the light penetrating portion x does not have the stabilizing layer 23a. Passes through the second resin plate 21 and enters the second resin plate 21.
Pass through.

The light that has passed through the resin plate 21 is reflected by a light entrance portion x
On the back surface of the third-layer copper foil 22b that covers the third layer. Copper foil 22b
The dark stabilization layer 23a formed on the surface of the substrate faces the back side of the four-layer substrate A, and there is no dark stabilization layer 23a on the back surface of the copper foil 22b to which light is applied, and the metal surface is exposed. ing. Therefore, the light that has passed through the resin plate 21
b is reflected on the metal surface.

Thus, the light that has entered the light-entering portion x of the reflecting portion X is not absorbed by the dark stabilizing layers 23a and 23b formed on the surfaces of the copper foils 22a and 22b, and the light of the copper foil 22b is not absorbed. It is efficiently reflected by the metal surface.

In the above embodiment, the light passing through the resin plate 21 is reflected on the back surface of the third copper foil 22b. However, as shown in FIG. In this case, the copper foil 22b is covered with the copper foil 23 of the fourth layer.

FIG. 5 shows another embodiment of the present invention. The present light emitting display unit uses a six-layer substrate D. 6-layer board D
In the above, five unit substrates 10 to 50 are polymerized,
6 layers of copper foils 12, 22,.
32a, 32b, 42, and 52 are stacked.

Copper foils 22, 32a, 32b, 42 of the intermediate layer
Are provided with dark stabilization layers 23, 33a, 33
b, 43 are formed. Stabilization layers 23, 33
a, 33b, 43, 23, 33a face the front side of the six-layer substrate D, and 33b, 43 face the front side of the six-layer substrate D.

At the light entrance portion x of the reflection portion X, the copper foils 22 and 32a whose stabilization treatment layers face the front side of the six-layer substrate D are removed in order to prevent light from being absorbed by the stabilization treatment layers. Then, the light passing therethrough is reflected on the back surface of the fourth copper foil 32b on which the stabilization processing layer is not formed.

Light that has passed through the copper foils 22, 32a may be reflected by any of the fourth to sixth copper foil layers 32b, 42, 52. The point is that it is only necessary to prevent light that has passed through the portions from which the copper foils 22 and 32a have been removed from leaking to the back side of the six-layer substrate D.

The present invention can be applied to all light emitting display units using four or more layers of substrates. The light emitting element is LE
It is not limited to the D element. Further, the metal foil is not limited to the copper foil, and a stabilization process other than the black process can be applied.

[0027]

As described above, in the light emitting display unit according to the present invention, the stabilizing process is performed so that the invading light is not absorbed by the dark stabilization processing layer at the light entering portion in the reflection portion of the multilayer substrate. Since the metal foil whose processing surface faces the front side of the substrate is completely removed, and the penetrating light passing through the removed portion is reflected on the metal surface of the metal foil located on the back side of the substrate from the metal foil, the metal foil Despite the use of a multilayer substrate having a dark stabilizing layer formed on the surface, it exhibits excellent front extraction efficiency. In addition, the present invention can be practiced by considering the passage and reflection of light at the light-entering portion when designing the pattern of the copper foil, and is easy to implement.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a conventional light emitting display unit.

FIG. 2 is a graph showing a reflectance spectrum of a copper reflecting surface.

FIG. 3 is a cross-sectional view illustrating a configuration example of a light emitting display unit of the present invention.

FIG. 4 is a sectional view showing another configuration of the light emitting display unit of the present invention.

FIG. 5 is a sectional view showing another configuration of the light emitting display unit of the present invention.

[Explanation of symbols]

 A Four-layer board B Housing C LED element D Six-layer board 10-50 Basic board 11-51 Resin plate 12-62 Copper foil 23-53 Stabilization treatment layer X Reflection part x Light penetration part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G09F 9/33 G09F 13/20 H01L 33/00

Claims (5)

(57) [Claims] 1. A metal foil having a predetermined pattern is laminated in four or more layers via a light-transmitting resin plate, and a stabilization treatment for forming a physically stable dark compound on the surface of the metal foil of the intermediate layer is performed. A plurality of light emitting elements are regularly mounted and arranged on the formed multilayer substrate, and the light emitting elements are selectively lit to display a character or the like in a dot pattern. At the light-entering part where the metal foil on the substrate surface has been removed in the nearby reflective part, the metal foil whose stabilization surface faces the front side of the substrate is entirely covered so that the penetrating light is not absorbed by the dark stabilization layer. as reflected in the metal foil is removed, positioned on the substrate backside of a metal foil which penetrate light is removed which has passed through the removed portion, the light entering portion
Of any metal foil located below the removed part
A light-emitting display unit characterized by being covered with a light-emitting device. 2. The light emitting display unit according to claim 1, wherein the light emitting element is an LED. 3. The light emitting display unit according to claim 1, wherein the stabilization processing is black processing. 4. The light emitting display unit according to claim 1, wherein said metal foil is a copper foil. 5. The light emitting display unit according to claim 1, wherein a gold plating is applied to a surface of the metal foil on the surface of the substrate.