JPH0241655Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in a dot matrix light-emitting display constructed using a semiconductor chip such as a light-emitting diode as a light-emitting element.

Prior Art This type of dot matrix light-emitting display is one in which arbitrary characters, symbols, and patterns can be displayed as a dot pattern by energizing any of the light-emitting elements arranged in a matrix and lighting them. It is.

In order to improve the visibility of the light emitting parts of such a matrix display, a mask plate with through holes formed in areas corresponding to the light emitting elements arranged on the substrate is bonded directly onto the substrate and integrated. It is conceivable that the

However, when considering the method of manufacturing a matrix display, the above method has the following problems.

In other words, when a liquid thermosetting resin is injected into the through hole of a mask plate to seal a light emitting element, the shrinkage force generated during thermosetting of the sealing resin directly affects the mask plate, causing the mask plate to warp. , distortions, cracks, etc. (hereinafter referred to as defects such as warping), making it easy to produce defective products.

Therefore, it is conceivable to fix the mask plate onto the substrate by a method other than adhesion, but such a method requires a separate means for fixing the mask plate, making manufacturing work difficult.

Problems to be Solved by the Invention The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a dot matrix light-emitting display that is less prone to defects such as warping during manufacturing and can simplify manufacturing operations. It is an object.

Specific Means for Solving the Problems The above object is achieved by the dot matrix light emitting display of the present invention, which has the following structural features.

That is, in this invention, a mask plate in which through holes are formed corresponding to each of these light emitting elements is placed on a substrate on which light emitting elements are arranged, and each of the through holes is further filled with a curable sealant. In a dot matrix light emitting display in which a sealing layer is formed on each of the light emitting elements by injecting a resin, the sealing layer is provided between the mask plate and the sealing layer portion inside the through hole of the mask plate. The present invention is characterized in that a separation frame that absorbs and relieves shrinkage force when the resin hardens is fitted into the mask plate in a non-adhesive state.

Effects and Effects of the Invention According to the invention, the sealing resin forming the sealing layer is placed between the mask plate and the sealing layer portion that seals the light emitting element inside the through hole of the mask plate. A separation frame that absorbs and alleviates the shrinkage force generated during curing is fitted into the mask plate without adhering to it, effectively preventing the shrinkage force generated when the sealing resin cures from affecting the mask plate. It can be prevented.

Further, according to the present invention, since the separating frame is not bonded to the mask plate, the manufacturing cost can be reduced regardless of the material of the separating frame.

Furthermore, since the separation frame into which the sealing resin is injected is bonded and integrated with the substrate, the light-emitting element is well sealed, unaffected by the external environment, and the lifespan of the dot matrix light-emitting display is improved. can.

Embodiments of the invention Examples of the invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is an enlarged view of a light emitting section.

In the figure, 1 is a display substrate, and 2 is a mask plate.

The display substrate 1 has light-emitting parts A provided with light-emitting elements 3 (LED semiconductor chips) arranged in a matrix (8×8 in the example), and each light-emitting element 3 is arranged on the substrate 1. It is attached by silver paste or the like on a conductive part 1c formed on the upper surface of the insulating plate 10, which is electrically connected to the lower electrode pattern 1b provided on the lower surface of the insulating plate 10 through a through hole 1d.
The upper part of the light emitting element 3 is connected via a bonding wire 7 to an upper electrode pattern 1a provided on the upper surface of an insulating plate 10. Such a light emitter element 3
are upper electrode pattern 1a and lower electrode pattern 1
The light is turned on by passing a current between the two terminals.

On the other hand, reference numeral 4 denotes a separation frame constituting the main part of the present invention, which is fitted into the through hole 6 of the mask plate 2 without being bonded to the mask plate 2.

Such a separation frame 4 in the present invention is hard,
Although it can be formed using any soft resin material,
Cheap hard materials can be suitably used.

A translucent curable resin (for example, a thermosetting resin or an ultraviolet curable resin) 5 (liquid) is injected into the separation frame 4, and is cured by heating or ultraviolet irradiation to emit light. A sealing layer for the body element 3 is formed.

Here, the transparent curable resin 5 for sealing the light emitting element 3 is filled below the upper end surface of the separation frame 4 in order to allow the separation frame 4 to absorb the shrinkage force generated during curing. It is necessary to be present.

Although the separation frame 4 is only fitted into the through hole 6 of the mask plate 2 in a non-adhesive state 8, the separation frame 4
The separation frame 4 is fixed to the substrate 1 by a so-called anchor effect by the sealing resin 5 injected into the opening.

In addition, in order to more effectively fit the separation frame 4 into the through-hole 6 portion of the mask plate 2 in a non-adhesive state 8, the separation frame 4 is in contact with the inner circumferential surface of the through-hole 6 of the mask plate 2. It is desirable to coat the surface with Teflon or the like, so that the shrinkage force of the sealing resin 5 during curing can be more effectively absorbed and relaxed without being applied to the mask plate 2.

The separation frame fitted into the through hole 6 of the mask plate 2 may be formed into a circular frame 41 as shown in FIG. 4.

5 and 6 show other examples of separation frames, in which a recess 21 is provided inside the through hole 6 of the mask plate 2, and separation frames 42 and 43 are placed in the recess 21 in a non-adhered state 8. It was inserted into. In such an embodiment, the separation frames 42 and 43 are not visible from the outer surface of the mask plate 2, which has the advantage of simplifying the mask plate 2 and improving its appearance. As explained above, in the matrix light emitting display of the present invention, the separation frame 4 is placed in the through hole 6 of the mask plate 2 in a state 8 in which it is not adhered to the mask plate.
However, if the mask plate 2 and the substrate 1 are fixed in a non-adhesive state, the temperature changes caused by the manufacturing and use of the matrix display body can be avoided.
It is also possible to effectively prevent defects such as warpage caused by differences in thermal expansion characteristics between the mask plate 2 and the substrate 1.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention;
FIG. 2 is an enlarged view of the light emitting section, and FIGS. 3 to 6 are enlarged vertical cross-sectional views of the light emitting section in various embodiments of the present invention. Explanation of symbols: In the figures, 1...matrix substrate, 2...mask plate, 3...light emitter element, 4,4
1, 42, 43... Separation frame, 5... Curable sealing resin, 6... Through hole of mask plate.

Claims (1)

[Claims for Utility Model Registration] A mask plate in which through holes are formed corresponding to each of the light emitting elements is arranged on a substrate on which light emitting elements are arranged, and each of the through holes is further provided with a curable material. In a dot matrix light-emitting display in which a sealing layer is formed on each of the light-emitting elements by injecting a sealing resin, the above-mentioned material is placed between the mask plate and the sealing layer portion inside the through-hole of the mask plate. 1. A dot matrix light-emitting display, characterized in that a separation frame is fitted into the mask substrate in a non-adhesive manner to relieve the shrinkage force of the sealing resin when it hardens.