JPH0328460Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a dot matrix light-emitting display that improves visibility by emitting light from a light-emitting part to a specific area and increasing brightness in a specific direction. Regarding.

Prior Art This type of dot matrix light-emitting display is capable of displaying any character, symbol, or pattern as a dot pattern by dynamically lighting any of the light-emitting elements arranged in a matrix. It is something. In order to improve the visibility of the light-emitting parts of such a matrix display, it has been considered that a mask plate with through holes formed in the areas corresponding to the light-emitting elements arranged on the substrate is placed on the substrate. The main purpose of such a conventional dot matrix light emitting display is to increase the viewing angle and to increase the apparent light emitting area to improve visibility.

Problems to be Solved by the Invention However, when considering the purpose of use of the dot matrix light emitting display, it may be preferable to concentrate the irradiation area of the light emitting part on a specific location. When installing it in a high place where it is necessary to use it as a light-emitting display panel, etc., prevent the diffusion of light upward.
It is desirable to concentrate the irradiation light from the light emitting section in an area that can be seen by the human eye, that is, in a downward direction.

The present invention is in response to such demands, and aims to provide a dot matrix light-emitting display that prevents light from spreading to unnecessary areas and concentrates the irradiated light from the light-emitting part on a specific area. The purpose is

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, this invention provides a dot matrix light-emitting display comprising a substrate on which light-emitting elements are arranged, and a mask plate in which through holes are formed corresponding to each of these light-emitting elements. The upper and lower openings of the through-hole are formed with their centers eccentrically arranged, and a light-reflecting surface is formed on the inner peripheral surface of the through-hole that communicates with the upper and lower openings. The present invention is characterized in that a sealing layer filled with a resinous sealant to prevent light emitting elements is provided, and the upper surface of the sealing layer is formed into a concave surface.

Effects and effects of the invention According to the invention, the centers of the upper and lower openings of the through-hole of the mask plate are eccentric, and a light-reflecting surface is formed on the inner peripheral surface of the through-hole that communicates with the upper and lower openings. Therefore, the emitted light from the light emitting element is concentrated on a specific irradiation area defined by the eccentricity of the upper and lower openings of the through hole, and the light is focused on the concave lens by the concave surface of the sealing layer. It is emitted in a concentrated manner by the action.

Therefore, the luminous flux density within the specific irradiation area increases, the brightness within the specific irradiation area improves, and visibility is significantly improved.

Therefore, when the dot matrix light-emitting display is used in a light-emitting display panel installed at a high place, etc., its marketability is improved and it is extremely beneficial.

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

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is a longitudinal cross-sectional structural view of the light emitting part.

In the figure, 1 is a display substrate, and this display substrate 1 is a light emitting element 2 (LED semiconductor chip).
The light-emitting parts A are arranged in a matrix (X8 in the example), and each light-emitting part A
As can be seen from FIG. 2, the light emitting element 2 in FIG.
A light emitting element 2 is attached to b using silver paste or the like, and the upper part of the light emitting element 2 is attached to the insulating plate 1 of the substrate 1.
It is electrically connected to a lower electrode pattern 11c provided on the lower surface of the insulating plate 10 through a through hole 11d, and connected to a conductive portion 11a formed on the upper surface of the insulating plate 10 via a bonding wire 21. In addition, 11e
is an insulating portion that insulates the conductive portion 11a and the upper electrode pattern 11b.

Reference numeral 3 denotes a mask plate made of an insulating material, and a plurality of through holes 31 are formed in accordance with the light emitting elements 2. This mask plate 3 prevents leakage of the luminous flux emitted from the light emitting element 2, enlarges the apparent diameter of the light emitting part A, and makes its outline clear, thereby improving the visibility of the dot matrix light emitting display. The first purpose is to protect the conductive pattern formed on the upper surface of the display substrate 1. When sealing the light emitting element 2 (for example, thermosetting or ultraviolet curing liquid resin is used)
It is used to prevent sealing resin from leaking. Such mask plate 3 is desirably made of a flexible material such as silicone rubber or neoprene rubber in order to prevent it from warping or deforming due to temperature changes.

The respective center positions R0 and r0 of the upper opening 31a and lower opening 31b of the through hole 31 of the mask plate 3 are set by a predetermined amount s.
This eccentricity causes the light emitting part A to
A mask plate 3 is used to direct the emitted light from the
All the through holes 31 formed in the hole 31 are defined in the same direction.

Then, a light reflecting surface 4 is formed on the inner peripheral surface of the through hole 31 that communicates the upper opening 31a and the lower opening 31b of the through hole 31 of the mask plate 3 by applying a paint with high light reflectance. There is.

When the mask plate 3 is made of a white material, the light reflecting surface 4 is formed by forming the through hole 31 of the mask plate 3.
A simple structure may be used in which the inner circumferential surface of the light-emitting part A is simply formed to be smooth, but in order to increase the brightness of the light-emitting part A, it is better to form the light-emitting part A by applying paint such as silver to the smooth surface.
Furthermore, a frame body (not shown) made of aluminum or the like is inserted into the through hole 31.
It may be formed by pasting it on the inner circumferential surface of.

R is the radius of the upper opening, R0 is its center, r is the radius of the lower opening, r0 is the center, and the amount of eccentricity is s
is shown.

In the present invention, such eccentricity s can take any value depending on the direction to be irradiated, but according to the inventors' experiments, the eccentricity from the center R0 of the upper opening is defined as s. In this case, it is desirable to set the value to R/5≦s≦R/2.

Further, the magnitude relationship between R and r is generally R≧r, and desirably R/3≦r<R. Further, R<r may be satisfied depending on the use of the dot matrix light emitting display.

Further, each of the light emitting elements 2 provided in the light emitting section A is sealed with a curable light-transmitting resin (for example, a thermosetting resin or an ultraviolet curable resin), as shown in FIG. In this case, forming the upper surface of the sealing layer 5 into a concave surface 5a also has a light focusing effect of the concave lens, increasing the luminous flux density around the light emitting part A. Since the clarity of the outline of the light-emitting portion is improved, it is possible to obtain a dot matrix light-emitting display that is brighter and easier to see.

Note that the dot matrix light-emitting display of the present invention is not limited to one in which each light-emitting element is lit by a dynamic drive circuit, considering its purpose.
It goes without saying that it may be possible to simultaneously light up all of the light emitting elements.

FIG. 5 shows an example in which the dot matrix light-emitting display of the present invention is used as a display panel and placed at a high place. When one embodiment of the present invention is configured, the elevation angle θ is 45 degrees to 60 degrees. Good results were obtained in a range of degrees.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention, Fig. 2 is a diagram showing the longitudinal cross-sectional structure of the light emitting portion along with the eccentricity of the opening of the through hole, and Fig. 3 is a dot matrix of the present invention. It is a figure which shows the example of use of a light emitting display body. In the figure, 1...matrix substrate, 2...light emitter element, 3...mask plate, 31...through hole thereof, 31a...
Upper opening of the through hole, 31b... Lower opening of the through hole, 4... Reflective surface, 5... Sealing layer, 5a... Concave surface.

Claims (1)

[Scope of utility model registration request] In a dot matrix light-emitting display comprising a substrate on which light-emitting elements are arranged and a mask plate in which through-holes are formed corresponding to each of these light-emitting elements, an opening above the through-hole in the mask plate is provided. and the center position of the lower opening is eccentric, a light reflecting surface is formed on the inner peripheral surface of the through hole communicating with the upper opening and the lower opening, and the through hole is filled with a sealant made of a curable translucent resin. 1. A dot matrix light-emitting display, comprising a sealing layer for sealing a light-emitting element, and the upper surface of the sealing layer is formed into a concave surface.