JPH10229221A - Light emitting diode display and image picture display using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To break the restraint on the dent forming angle, by a method wherein a dent having a reflection wall is made on a substrate to form an electrode pattern on the first surface of the insulating layer with a dent made thereon for fixing a light emitting diode in the dent. SOLUTION: An insulating layer 202 composed of a non-wooven glass fiber impregnated with an epoxy resin is formed on a substrate 2 and then this insulating film 202 is formed for spot facing so as to form dents 207G, 207R, 207B with a reflection wall 207a. Next, a green electrode 203G, a red electrode 203R, a blue electrode 203B, and a common electrode pattern 204 are formed on the surface of the insulating layer 202 formed of the dents 207G, 207R, 207B. Finally, light emitting diodes 200G, 200R, 200B fixed to respective electrode patterns 203G, 203R, 203B and respective dents 207G, 207R, 207B are connected by bonding wires 206G, 206R, 206B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode display device and an image display device using the same, and
The present invention relates to a light-emitting diode display device that improves the reflection efficiency of output light, eliminates restrictions on the angle at which a reflection wall is formed, and improves reliability, and an image display device using the same.

[0002]

2. Description of the Related Art As a conventional light emitting diode display device,
For example, there is one disclosed in JP-A-2-33185.

FIG. 9 shows such a light emitting diode display device, in which a plurality of row electrodes 103, a plurality of column electrodes 104, and wiring leads 105 are formed on an aluminum substrate 101 having an insulating layer 102, and are formed by pressing or pressing. A predetermined number of depressions 107 are formed in a matrix at an angle θ in the aluminum substrate 101, and the light emitting diodes 100 are arranged in the depressions 107. The upper electrode (not shown) of the light emitting diode 100 has a row electrode 103 via a bonding wire 106.
, And a lower electrode (not shown) is connected to the column electrode 104 via the wiring lead 105. Hollow 1
07 has, for example, a circular inclined reflecting wall 107a.

In the above configuration, the electrodes 1 in rows and columns
When a predetermined drive voltage is applied between the light emitting devices 03 and 104, the light emitting diode 100 emits light, and the output light emitted from the upper portion and the output light emitted from the side surface and reflected by the reflecting wall 107a are formed by a resin lens formed on the upper portion (Not shown)
The light is emitted with a predetermined directivity while being collected.

[0005]

However, according to the conventional light emitting diode display device, when forming the depression, the wiring pattern may be stressed and disconnected, so that the angle θ must be 45 ° or less. Therefore, the reflection efficiency of the output light is reduced, and the reliability in quality is reduced. Further, since a protrusion corresponding to the depression is formed on the back surface of the aluminum substrate, a structural problem such as an increase in thickness occurs.

Accordingly, it is an object of the present invention to provide a light emitting diode display device and a light emitting diode display device capable of eliminating the limitation of the angle of forming the depression, thereby improving the reflection efficiency of output light and improving the reliability in quality. To provide an image display device utilizing the same.

Another object of the present invention is to provide a light emitting diode display device which eliminates structural problems such as an increase in thickness and an image display device using the same.

[0008]

According to a first aspect of the present invention, a dent having a reflecting wall is formed on a substrate, and a light emitting diode is mounted on a bottom surface of the dent. In a light emitting diode display device that emits the output light while reflecting the output light on the reflection wall, the substrate has an insulating layer having the depression formed therein and an electrode pattern formed on a first surface of the insulating layer. The light emitting diode is
There is provided a light emitting diode display device fixed in the depression.

In order to achieve the above object, according to a second aspect of the present invention, a plurality of depressions having a reflecting wall are formed on a substrate in a predetermined pattern such as a matrix, and a bottom surface of the plurality of depressions is formed. In each of the image display devices, a light emitting diode is mounted, and the light emitting diode is driven in accordance with an image signal, and the output light is emitted while being reflected by the reflecting wall to display a predetermined image.
An image display device, comprising: an insulating layer having the depression formed therein; and an electrode pattern formed on a first surface, wherein the light emitting diode is fixed in the depression.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the light emitting diode display device according to the present invention will be described.

FIG. 1A shows a first embodiment of a light-emitting diode display device according to the present invention, in which three light-emitting diodes 207G, 207R, and 207B formed on a substrate, which will be described later, are fixed to the bottom surface. Two light emitting diodes 200G (green), 2
00R (red) and 200B (blue). In the light emitting diode 200G, a first electrode formed on the upper surface is connected to a green electrode pattern 203G via a bonding wire 206G, and a second electrode formed on the upper surface is similarly connected to a common electrode pattern via a bonding wire 208G. 20
4 is connected. In the light emitting diode 200R, a first electrode formed on the upper surface is connected to the red electrode pattern 203R via a bonding wire 206R. In the light emitting diode 200B, the first electrode formed on the upper surface has the blue electrode pattern 20 via the bonding wire 206B.
3B, and a second electrode similarly formed on the upper surface is connected to the common electrode pattern 204 via a bonding wire 208B. 3 recesses 207G, 2
07R and 207B are surrounded by a common reflecting wall 207a.

FIG. 1B shows a cross section taken along the line BB of FIG. 1A, and the same parts are indicated by the same reference numerals. Parts not shown in FIG. 1A will be described. The above-mentioned substrate 2 is made of a base material layer 2 made of non-woven glass fiber impregnated with epoxy resin.
02. The base layer 202 is formed with depressions 207G, 207R, 207B surrounded by a reflection wall 207a, and a green electrode pattern 203G, a red electrode pattern 203R, a blue electrode pattern 203B, and a common electrode pattern 204 are formed on the upper surface thereof. In addition, a predetermined wiring pattern 211 is formed on the back surface. Depression 207R
Is that the red light emitting diode 200R is higher in height than the other light emitting diodes 200G and 200B, so that the depth is larger than the other depressions 207G and 207B, and the upper surface of each light emitting diode is level. Has been matched. The insulating bottom surfaces of the light emitting diodes 200G and 200B and the lower electrode of the light emitting diode 200R are silver pastes 212G, 212R and 212 which are conductive pastes.
B, the metal layers 201G, 201B and the electrode pattern 2 on the bottom surfaces of the depressions 207G, 207R, 207B.
01R.

Next, a method of manufacturing the substrate 2 will be described. The base layer 202 made of non-woven glass fiber impregnated with epoxy resin is subjected to counterboring to form recesses 207G and 207.
R and 207B are formed in order. Next, the glass fibers on the surfaces of the depressions 207G, 207R, and 207B are melted with a chemical by a desamid treatment, and dust is removed by blowing high-pressure air. Next, copper plating is performed on the surface of the base material layer 202 including the depressions 207G, 207R, and 207B, and a photolithography process is performed to form green, red, blue, and common electrode patterns 203G, 203R, 203B, 204, and the like. Form. Next, Ni is added to the wiring pattern including the electrode pattern.
/ Au plating is applied. Thereafter, mounting of a light emitting diode, wire bonding, and the like are performed.

According to the light emitting diode display of the first embodiment described above, the following effects can be obtained. (1) The base layer 202 is subjected to counterbore processing to form a recess 207G,
Since the 207R and 207B are formed, the reflection wall 207a having an arbitrary angle θ in the range of 0 ° to 90 ° can be formed only by changing a dedicated drill. 9 reflection walls 207a
When the angle is close to 0 °, the emission range of the radiated light can be reduced to narrow the directivity, and when the angle is set close to 0 °, the emission range of the radiated light can be widened. (2) Since the reflecting wall 207a having an arbitrary angle can be formed, if an angle having a high reflection efficiency is determined, the angle can be easily set to that angle. (3) Since the reflecting wall 207a having an arbitrary angle can be formed, there is no restriction on manufacturing. (4) Since the nonwoven glass fiber is used for the base material layer 202, the reflection wall 20 having a high surface smoothness even if the counterbore processing is performed.
7a can be formed. Therefore, the reflection wall 207a
Can be increased in reflectance. (5) The red light emitting diode 200R having a large light emission intensity is disposed at the center, and the recess 207R is formed so as not to protrude.
, The color composition with excellent color balance can be realized. (6) Since the wiring pattern is formed after forming the depressions 207G, 207R, and 207B, a wiring pattern without disconnection can be obtained, and the reliability in quality can be improved. (7) Since the recesses 207G, 207R, and 207B are formed by counterboring, no projecting portion is formed on the opposite side, and no structural problem such as an increase in thickness occurs.

FIG. 2 shows a light-emitting diode display device according to a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a duplicate description will be omitted. , Light emitting diodes 200G, 200R, 200B
Are located at each vertex of the equilateral triangle, and the common electrode pattern 204
Are recesses 207G and 207 formed at each vertex of an equilateral triangle.
R, 207B and the reflective wall 207a, and are formed in green, red, and blue electrode patterns 203G, 203G.
The configuration in which R and 203B are arranged at intervals of 120 ° is different from the first embodiment.

According to the second embodiment, the intervals between the light emitting diodes 200G, 200R, and 200B can be all equal, so that the displacement of the light emitting position based on one-color lighting, two-color lighting, and three-color lighting is small. In addition, the influence of the angle can be eliminated.

FIG. 3 shows a third embodiment of the light-emitting diode display device of the present invention, and the parts common to those of the first and second embodiments are indicated by the same reference numerals. Although omitted, only one circular depression 207 is formed, and the light emitting diodes 200G, 200R, 200B are arranged at the positions of the equilateral triangle on the bottom surface. The upper electrode of the red light emitting diode 200R is connected to the common electrode pattern 204, and the lower electrode is directly connected to the electrode pattern 201R (not shown) connected to the red electrode pattern 203R by a silver paste. Light-emitting diodes 200G and 200B for green and blue
Has an insulating bottom fixed to a silver paste (not shown) by silver paste.

In the third embodiment, the same effect as that of the second embodiment can be obtained. However, since only one depression 207 is formed, only one counterbore processing is required. The cost can be reduced.

FIG. 4 shows an embodiment of a light emitting display unit 1 constituting an image display device according to the present invention. The surface of a light emitting substrate 2 corresponding to the above described substrate is constituted by the above described light emitting diode display device. A plurality of rows of light emitters 4 (light emitter rows 4a) are arranged in parallel. In the present embodiment, a chip-on-board (CO
The luminous bodies 4 are mounted together with the reflectors 3 in a 16 × 16 matrix by the method B). Lenses 5 are provided on the surface of the light-emitting body substrate 2 so as to cover the light-emitting surface of each light-emitting body 4. The detailed configuration of the lens 5 will be described later. The arrangement of the light emitters 4 is not limited to a matrix shape, but may be a staggered shape.

When it is desired to enlarge the display area, the light-emitting substrates 2 having the same configuration can be connected to each other vertically and horizontally.
Projections 13 are provided on two sides of the reflection plate 3 for the positioning. Further, on the other two sides on the opposite side, projections 13
The concave portion 14 is provided at a position symmetrical with respect to.

The reflector 3 has the same size (for example, 144 mm × 144 mm) as the surface area of the luminous substrate 2, is made of a weather-resistant black resin material, and has a gloss finish. On the surface of the reflecting plate 3, for example, partitioning plates 3 a having a height of 8 to 10 mm, which are formed by resin molding and are horizontally and vertically arranged at equal intervals, so as to partition the respective light emitter rows 4 a.

FIG. 5 shows a side view of the light emitting display unit 1,
A reflector 3, a light emitter 4, and a lens 5 are provided on the front surface of the light emitting substrate 2, and an insulating sheet 6, a heat radiating plate 7, and a drive circuit board 8 are provided on the rear surface of the light emitting substrate 2.

The insulating sheet 6 is for preventing a short circuit due to contact between the wiring pattern of the light emitting body substrate 2 and the heat radiating plate 7 when the heat radiating plate 7 is disposed in close contact therewith. It is formed of a material having excellent properties and thermal conductivity, and has substantially the same size as the light emitting substrate 2.
Also, the insulating sheet 6 has a part of the periphery that is a connector pin 9.
The cut is made so as not to hinder the penetration of a.

The heat radiating plate 7 is made of, for example, aluminum, has a thickness of 2 mm, and has substantially the same shape as the insulating sheet 6. The heat radiating plate 7 is fixed to the reflecting plate 3 by using a plurality of (twelve in this embodiment) tapping screws 10 in such a manner that the insulating sheet 6 and the luminous body substrate 2 are fastened together. For this purpose, tapping screw 1
The light emitting body substrate 2 and the insulating sheet 6 are provided with the same number of fool holes as the tapping screws 10 in accordance with the mounting position of 0. The heat radiating plate 7 has a heat radiating function and a light emitting substrate 2.
It also has the function of preventing deformation (twisting, etc.) of, and maintaining flatness. At the four corners of the heat radiating plate 7, a spacer 11 having a cylindrical shape and at least the surface made of resin is attached by screws 12. By providing the heat radiating plate 7, the heat radiation of the luminous body substrate 2 is enhanced, and even if the heat radiating plate 7 causes distortion, it is corrected.
The flatness of the luminous body substrate 2 is maintained, an electrical accident can be prevented, and a decrease in visibility can be prevented by maintaining the flatness.

The luminous substrate 2 is formed by using a glass epoxy resin, for example, as described in the first embodiment of the light emitting diode display device described above, and is 16 × 16.
One character is displayed by (n × m) dots. Therefore, when displaying four characters, four light emitting display units 1 are arranged in parallel. Also,
On the back surface of the light emitting body substrate 2, connectors 9 for connection to a control circuit of the drive circuit board 8 are provided at a plurality of peripheral locations.

FIG. 6 shows the reflecting plate 3, in which through holes 3c are provided at regular intervals on a base portion 3b on which a partition plate 3a is erected, and a small diameter is provided below the through hole 3c. A large groove 3d is provided so that the lens 5 can be positioned and held.

FIG. 7 is a sectional view taken along line AA of FIG. 4, and FIG.
3B shows a cross section, and the luminous body 4 is mounted on the surface of the luminous body substrate 2 so as to be aligned with the center of the lens 5 with a silver paste. Parts common to those in FIG. 1B are denoted by common reference numerals.

The light emitter 4 is composed of the light emitting diodes 200G, 200R, and 200B as described with reference to FIG. 1B, and the light emitting diode 200R is mounted at the center so as to match the center of the lens 5. The light emitting diodes 200G, 200R, and 200B mounted in this manner are coated on the upper surface with a protective member 15 having a lens function of silicon or epoxy resin. The protection member 15 includes light emitting diodes 200G, 200R,
00B as well as the light emitting diode 200
It also serves to increase the critical angle in G, 200R, and 200B, increase the light output to the outside, and improve the luminous efficiency. Since the luminous substrate 2 has been described as the substrate 2 in FIG. 1B, the description is omitted here.

The lens 5 is, as shown in FIGS. 7 and 8,
It has a lens body 5a, and a projection 5b is formed on the periphery of the lens body 5a. The lens 5 is made of a transparent plastic or glass and has a substantially oval aspherical shape. The projection 5b is formed in the through hole 3c of the reflection plate 3.
Is pressed down by the groove 3d, and is pressed against the surface of the luminous body substrate 2 to hold the lens 5.
Therefore, the lens 5 can be mounted without performing bonding or screwing, and a dedicated component for fixing the lens 5 can be omitted. As shown in FIG. 7, the lens 5 enlarges and projects the light from the light emitter 4 in a direction along the light emitter row 4a (hereinafter referred to as “XZ plane direction”), and as shown in FIG. In addition, it has a directional characteristic of condensing light from the light emitter 4 in a direction orthogonal to the light emitter array 4a (hereinafter referred to as “YZ plane direction”). If the lens 5 is formed by plastic molding, it can be processed into an arbitrary shape, so that a desired directional characteristic can be easily obtained, and excellent mass productivity can be obtained. Further, since the portion in the XZ plane direction (horizontal direction) of the lens 5 is not shielded by the third member, a horizontal visual field can be secured.

[0030]

As described above, according to the light emitting diode display device of the present invention and the image display device using the same, since the recess is formed by performing the counterboring process or the like on the insulating layer of the substrate, the angle can be set at any angle. A depression having a reflection wall can be easily formed, and a depression having a reflection wall with high reflection efficiency can be obtained. Further, since no protrusion is formed on the opposite side of the substrate, no structural problem such as an increase in thickness occurs.

[Brief description of the drawings]

FIG. 1 (a) is a first view of a light emitting diode display device according to the present invention.
FIG. 2 is a plan view showing the embodiment. (b) is a sectional view taken along line BB of (a).

FIG. 2 is a plan view showing a light-emitting diode display device according to a second embodiment of the present invention.

FIG. 3 is a plan view showing a light-emitting diode display device according to a third embodiment of the present invention.

FIG. 4 is a plan view showing an embodiment of the image display device of the present invention.

FIG. 5 is a side view showing an embodiment of the image display device of the present invention.

FIG. 6 is a perspective view showing a reflector in the embodiment of the image display device of the present invention.

FIG. 7 is a sectional view taken along line AA of FIG. 4;

FIG. 8 is a sectional view taken along line BB in FIG. 4;

FIG. 9 is a cross-sectional view showing a conventional light emitting diode display device.

[Explanation of symbols]

Reference Signs List 1 light emitting unit 2 substrate 3 reflector 4 light emitting diode 5 lens 7 heat sink 8 drive circuit board 15 protective film 200G, 200R, 200B light emitting diode 202 base layer 203G, 203R, 203B, 204 electrode pattern 206G, 206R, 206B bonding Wire 207, 207G, 207R, 207B Depression 207a Reflection wall 208G, 208B Bonding wire 211 Wiring pattern 212G, 212R, 212B Silver paste

Claims (12)

[Claims] 1. A light emitting diode display device in which a dent having a reflecting wall is formed in a substrate, a light emitting diode is mounted on the bottom of the dent, and the output light is emitted while being reflected by the reflecting wall. A light emitting diode, comprising: an insulating layer having the recess formed therein; and an electrode pattern formed on a first surface of the insulating layer, wherein the light emitting diode is fixed in the recess. Display device. 2. The structure according to claim 1, wherein the recess is formed in the insulating layer by counterboring, and the light emitting diode is connected to the electrode pattern in the recess formed in the insulating layer. A light-emitting diode display device according to claim 1. 3. The light emitting diode display according to claim 2, wherein said insulating layer is made of non-woven glass fiber impregnated with epoxy resin. 4. The insulating layer has first to third recesses formed as the recesses, wherein the light emitting diode includes a green light emitting diode fixed in the first recess, The light emitting diode for red light fixed in the second depression and the light emitting diode for blue light fixed to the first copper conductor layer in the third depression. LED display device. 5. The insulating layer has a predetermined wiring pattern connected to a connection terminal, and the green and blue light emitting diodes connect a first and a second electrode formed on an upper surface to a bonding wire. And an insulating layer formed on the lower surface of the first electrode via a conductive paste.
And fixed in the third recess, wherein the red light emitting diode has an upper electrode formed on the upper surface connected to the corresponding electrode pattern via a bonding wire, and a lower electrode formed on the lower surface. 5. The light emitting diode display device according to claim 4, wherein said light emitting diode display device has a configuration in which said second recess is connected to another electrode pattern via a conductive paste. 6. The method according to claim 6, wherein the second depression is formed between the first and third recesses.
The red light-emitting diode has a depth that is greater than the green and blue light-emitting diodes by a greater dimension than the depth of the depression, and the green, red, and blue light-emitting diodes Are third to third from the first so that the respective upper surface levels match.
The light-emitting diode display device according to claim 4, wherein the light-emitting diode display device is fixed in the recess. 7. A plurality of depressions having a reflecting wall are formed on a substrate in a predetermined pattern such as a matrix, and light emitting diodes are mounted on bottom surfaces of the plurality of depressions, respectively, and the light emitting diodes are driven according to image signals. In the image display device, the output light is emitted while being reflected by the reflection wall to display a predetermined image, wherein the substrate is formed on the insulating layer having the depression and the first surface. An image display device having an electrode pattern, wherein the light emitting diode is fixed in the depression. 8. The structure according to claim 7, wherein the recess is formed in the insulating layer by counterboring, and the light emitting diode is connected to the electrode pattern in the recess formed in the insulating layer. The image display device as described in the above. 9. The image display device according to claim 8, wherein the insulating layer is made of non-woven glass fiber impregnated with an epoxy resin. 10. The insulating layer has first to third recesses formed as the recesses, wherein the light emitting diode is a green light emitting diode fixed in the first recess, 9. The light-emitting device according to claim 8, further comprising: a red light-emitting diode fixed in the second depression, and a blue light-emitting diode fixed to the first copper conductor layer in the third depression. Image display device. 11. The insulating layer has a predetermined wiring pattern connected to a connection terminal, and the green and blue light emitting diodes connect a first and a second electrode formed on an upper surface to a bonding wire. And an insulating layer formed on the lower surface of the first electrode via a conductive paste.
And fixed in the third recess, wherein the red light emitting diode has an upper electrode formed on the upper surface connected to the corresponding electrode pattern via a bonding wire, and a lower electrode formed on the lower surface. The image display device according to claim 10, wherein the image display device is configured to be connected to another electrode pattern in the second depression via a conductive paste. 12. The second depression is larger than the depths of the first and third depressions by the size of the red light emitting diode being larger than the green and blue light emitting diodes. The green, red, and blue light emitting diodes have a depth of 3
The image display device according to claim 10, wherein the image display device is fixed in the recess.