JPH0832120A - Surface emission type display - Google Patents

Abstract

PURPOSE:To provide a structure from which desired emission luminance can be obtained for a surface emission type display composed of light emitting diodes used as light sources, etc., for back light of liquid crystal display devices. CONSTITUTION:A plurality of light emitting diode elements 2 are fitted in a matrix-like state to one main surface of a substrate 1 on which necessary wiring is formed and which is composed of a glass epoxy resin, etc. The elements 2 are mounted on the wiring at prescribed positions and one electrodes of the elements 2 are electrically connected with the wiring. The other electrodes of the elements 2 are electrically connected in suitable states to the wiring through wires 2a, etc. A resin injecting section 4 is formed around the elements 2 by fitting a reflecting plate 3 composed of a white resin to the substrate 1 around the elements 2 so as to surround the elements 2 and a protective layer 5 is formed in the resin injecting section 4 by injecting a transparent or translucent resin, such as the epoxy, silicon, etc., containing a milky white diffusing agent into the resin injecting section and hardening the resin. In addition, a continuous groove section 6 is formed on the upper surface of the reflecting plate 3 so that the section 6 can surround the section 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface emitting display using a light emitting diode used as a light source for a backlight of a liquid crystal display device, for example.

[0002]

2. Description of the Related Art Conventionally, as a surface emitting display of this type,
For example, a structure as shown in FIGS. 7 and 8 has been proposed. Reference numeral 11 denotes a substrate made of glass epoxy resin or the like, and necessary wirings, which are not shown in the drawing, are formed on one main surface of the substrate by a thick film wiring technique or the like. Reference numeral 12 denotes a light emitting diode element, which is mounted at a predetermined position of the wiring so that one electrode and the wiring are electrically connected to each other and the other electrode of the light emitting diode element. The wiring is appropriately electrically connected by means such as a wire 12a. Reference numeral 13 indicates a reflector around the light emitting diode element 12, which is made of a white resin such as polymer or polycarbonate, and reference numeral 15 indicates a milk-white diffusing agent in the resin injection portion 14 inside the reflector 13. A protective layer formed by injecting and solidifying a transparent or semi-transparent epoxy resin containing silicon or the like is shown.

In such a surface emitting display, the light emitting diode element 12 emits light, and the light diffused in the protective layer 15 is directly or indirectly reflected by the reflecting plate 13 in the protective layer 15. It will be on the top.

[0004]

The conventional surface emitting display using the above-described light emitting diode element is manufactured by the following method, for example. First, after forming necessary wiring on the substrate 11, the light emitting diode element 12 is mounted at a predetermined position on the wiring to connect one electrode to the wiring,
The other electrode is appropriately connected to the wiring by a wire 12a or the like. Next, so as to surround the light emitting diode element 12,
The reflector 13 is formed of a resin such as polymer or polycarbonate, and finally, in the resin injection portion 14 inside the reflector 13,
A resin such as epoxy or silicon containing a milky white diffusing agent is injected and solidified to form the protective layer 15.

At this time, the resin injection portion 14 inside the reflection plate 13
Since resin injection of epoxy or silicone into the resin has been conventionally performed manually by an operator, the resin injection part 1
The amount of resin injected into the resin 4 is adjusted by the amount of division such that the upper surface 13a of the reflection plate 13 and the upper surface 15a of the injected resin have substantially the same height. However, since the worker injects the resin in a proper amount, the resin injection amount inevitably varies, and as a result, the emission brightness varies among products. For example, as shown in FIG. 9A, the emission brightness becomes higher as the resin injection amount increases, and as the resin injection amount becomes smaller as shown in FIG. 9B, the emission brightness decreases. There is also a problem that the resin overflows to the inside of the reflection plate 13 when the resin injection amount becomes too large. It is a technical object of the present invention to provide a structure of a surface emitting display capable of solving these problems.

[0006]

In order to solve the above technical problems, the present invention takes the following technical measures.
That is, the surface emitting display according to claim 1 of the present application is
A light emitting diode element mounted on a substrate on which wiring is formed, a reflector formed so as to surround the light emitting diode element, a resin injection part inside the reflection plate, and a resin is injected into the resin injection part. In a surface emitting display including a resin protective layer formed as described above, a groove is provided on at least a part of the upper surface of the reflector.

Further, the surface emitting display according to claim 2 of the present application is the surface emitting display according to claim 1, wherein the continuous groove portion is provided on the upper surface of the reflector so as to surround the resin injection portion. It is characterized by doing so. Furthermore, in the surface emitting display according to claim 3 of the present application, in the surface emitting display according to claim 1 or 2, the groove is provided in a step provided on at least a part of the upper surface of the reflector. It is characterized by having done.

[0008]

With the above-mentioned structure, the present invention can be realized.
According to the invention described, when forming the resin protective layer,
A groove provided on the upper surface of the reflector traps an excessive amount of injected resin, and as a result, if the injection is stopped while the resin is flowing into the groove, a protective layer having a uniform thickness can be obtained.

According to the invention of claim 2 of the present application,
Excessive injection of resin uniformly flows into the groove formed over the entire circumference of the resin injection portion, so that the resin can be prevented from overflowing to the outside of the reflection plate over the entire circumference of the reflection plate. . Further, according to the invention of claim 3 of the present application, even when a large amount of resin has flowed into the groove and the resin overflows in the groove, the outer wall portion in the stepped portion overflows in the groove. It completely blocks the resin from overflowing to the outside of the reflector.

[0010]

Therefore, according to the present invention, the amount of the resin injected into the resin injection portion can be kept constant, and as a result, it is possible to provide the surface emitting display with less variation in the emission brightness. Has the effect.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. Reference numeral 1 denotes a substrate made of glass epoxy resin or the like, and a plurality of light emitting diode elements 2 are attached in a matrix on one main surface of the substrate 1. Although not shown in this embodiment, a wiring for guiding a power source required for causing the light emitting diode element 2 to emit light is formed on one main surface of the substrate 1 by a thick film wiring technique or the like, and The diode element 2 is mounted at a predetermined position of the wiring so that one electrode and the wiring are electrically connected, while the other electrode of the light emitting diode element and the wiring are electrically connected by a wire 2a or the like as appropriate. Connected. Around the light emitting diode element 2,
A reflector 3 made of a white resin made of polymer, polycarbonate or the like is attached so as to surround the light emitting diode element 2 to form a resin injection part 4, and the resin injection part 4 is made of a transparent or translucent material containing a milky white diffusing agent. Resin such as epoxy or silicon is injected and solidified to form the protective layer 5. Further, a continuous groove portion 6 is formed on the upper surface of the reflection plate 3 so as to surround the resin injection portion 4.

With such a structure, when injecting the resin into the resin injecting portion 4, if the amount of the resin slightly exceeding the height of the reflecting plate 3 is injected, as shown in FIG. Part 5b overflows and flows into the groove 6. Then, if the resin injection is stopped while the resin is flowing into the groove portion 6,
The heights of the surface 5a of the protective layer 5 and the surface 3a of the reflection plate 3 can be made substantially equal, and the protective layer 5 having a uniform thickness can be obtained. The height of the reflector 3 is set in advance so that a desired brightness can be obtained.

Further, in the present embodiment, the example in which the continuous groove portion is formed over the entire circumference of the upper surface of the reflection plate has been shown, but it is also possible to provide only a groove portion capable of absorbing at least overflowed resin. Further, as shown in FIG. 4A or 4B, the discontinuous groove portions 61 to 64 (see FIG.
(See (a)) or 65 to 68 (see FIG. 4B) may be formed. That is, in the case of FIG. 4A, the overflowed resin 5b is made to flow into and absorbed by the groove portions 61 to 64 at the four corners, and in the case of FIG. 4B, the overflowed resin 5b is absorbed into the groove portions on the four sides. By flowing into 65 to 68 and absorbing the same, the protective layer 5 having a uniform thickness can be obtained as in the above embodiment.

5 and 6 show another embodiment of the present invention. Similar to the embodiment of FIG. 1 of the present invention, reference numeral 1 is a substrate, reference numeral 2 is a light emitting diode element, reference numeral 3 is a reflector, reference numeral 4 is a resin injection portion, and reference numeral 5 is a protective layer. In this embodiment, the step portion 3a is formed on a part of the reflection plate 3, and the groove portion 6 is further formed on the step portion 3a. With such a configuration, even if the excess injected resin that slightly exceeds the amount that the groove 6 can absorb flows into the groove 6, the excess injected resin in the groove 6 is attracted by the outer wall portion 3b due to surface tension. The outer wall portion 3b serves as a breakwater, and it is possible to completely block the resin overflowing from the groove portion 6 from further overflowing to the outside of the reflection plate 3.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view of the periphery of the reflector plate, showing a state where resin has flowed into a groove provided on the upper surface of the reflector plate.

FIG. 4 is a diagram showing another formation pattern of the groove portion.

FIG. 5 is a plan view showing another embodiment of the present invention.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a plan view of a conventional example.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a cross-sectional view of a conventional example in which a large amount of resin is injected into a resin injection part and a cross-sectional view of a conventional example in which a small amount of resin is injected into a resin injection part.

[Explanation of symbols]

 1 Substrate 2 Light-Emitting Diode Element 3 Reflector 4 Resin Injection Section 5 Protective Layer 6 Groove

Claims (3)

[Claims] 1. A light emitting diode element mounted on a substrate on which wiring is formed, a reflector formed so as to surround the light emitting diode element, a resin injection part inside the reflection plate, and the resin injection part. A surface emitting display comprising a resin protective layer formed by injecting a resin into the surface emitting display, wherein a groove is provided on at least a part of the upper surface of the reflector. 2. The surface-emitting display according to claim 1, wherein
The surface emitting display, wherein the continuous groove portion is provided on the upper surface of the reflection plate so as to surround the resin injection portion. 3. The surface emitting display according to claim 1, wherein the groove is provided in a step provided on at least a part of an upper surface of the reflector.